Animation - OpenProcessing

mySketch
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// Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com
​
// Example 5-9: Simple Gravity
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float x = 750;   // x location of square
float y = 0;     // y location of square
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float speed = 0;   // speed of square
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// A new variable, for gravity (i.e. acceleration).   
// We use a relatively small number (0.1) because this accelerations accumulates over time, increasing the speed.   
// Try changing this number to 2.0 and see what happens.
float gravity = 0.1;  
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float r = 0;
float b = 0;
float g = 0;
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void setup() {
  fullScreen();
}
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void draw() {
  background(r,g,b);
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  // Display the square
  fill(175);
  stroke(0);
  rectMode(CENTER);
  rect(x, y, 10, 10);
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  // Add speed to location.
  y = y + speed;
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  // Add gravity to speed.
  speed = speed + gravity;
​
  // If square reaches the bottom
  // Reverse speed
  
  if(y > height) {
    // Multiplying by -0.95 instead of -1 slows the square down each time it bounces (by decreasing speed).  
    // This is known as a "dampening" effect and is a more realistic simulation of the real world (without it, a ball would bounce forever).
    speed = speed * -0.95;
    y = height;
    fill(random(100));
  }
}
​
void keyPressed() {
  if (key == CODED) {
    if(keyCode == UP) {
      y--;
      b++;
    } 
    else if(keyCode == DOWN) {
      y++;
      g--;
      r--;
      b--;
    }
    else if(keyCode == LEFT){
      x--;
      r++;
    }
    else if(keyCode == RIGHT){
      x++;
      g++;
    }
  }
}